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Kai-Bor Yu

from Schenectady, NY
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Related to:
Wen Lifan, 66Wenli F Yu, 66R Kaibor YuAnna S Yu, 39Kai Bor Yu, 71Christina T Yu, 41
Connected to:
Ah Y Yu, 45Ailin Yu, 60Alberto N Yu, 77Alfred F Yu, 73Amos L Yu, 50Anderson H Yu, 58Angeline Yu, 36Anliu Yu, 56Annie Yu, 64Archie Yu, 48

Kai-Bor Yu Phones & Addresses

  • Schenectady, NY
  • Lake Forest, CA

Publications

Us Patents

Monopulse Radar Processor For Resolving Two Sources

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US Patent:
6356231, Mar 12, 2002
Filed:
Jun 29, 2000
Appl. No.:
09/607146
Inventors:
Yibin Zheng - Rexford NY
Kai-Bor Yu - Niskayuna NY
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
G01S 1344
US Classification:
342149, 342195
Abstract:
A method and system for identifying the locations of plural targets lying within the main beam of a monopulse antenna including four ports for generating sum, elevation difference, azimuth difference, and double difference signals. The method comprises the steps of processing the sum, elevation difference, azimuth difference, and double difference signals in accordance with a series of linear equations to obtain a set of intermediate values; and processing the set of intermediate values in accordance with a set of algebraic equations to obtain signals representing an angular direction of each of the plural targets. Preferably, the method further includes the step of processing the sum, elevation difference, azimuth difference and double difference signals and the signals representing the angular directions of the targets according to a further set of algebraic equations to obtain signals representing the amplitude of the beam reflected from each of the targets. Also, in a preferred embodiment, the signals representing the angular direction of the targets include signals representing, for each of the targets, an angular direction of the target in an x-plane, and an angular direction of the target in a y-plane.

Matrix Monopulse Ratio Radar Processor For Two Target Azimuth And Elevation Angle Determination

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US Patent:
6404379, Jun 11, 2002
Filed:
Jun 29, 2000
Appl. No.:
09/607004
Inventors:
Kai-Bor Yu - Niskayuna NY
Yibin Zheng - Rexford NY
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
G01S 1344
US Classification:
342 80, 342147, 342148, 342149, 342152, 342194, 342195
Abstract:
A method and system for identifying the locations of plural targets lying within a main beam of a monopulse antenna including four ports for generating sum, elevation difference, azimuth difference and double difference signals. The method comprises the steps of forming a monopulse ratio matrix from the sum, elevation difference, azimuth difference and double difference signals; and determining eigenvalues of the monopulse ratio matrix. These eigenvalues are then used to determine the angular locations of the plural targets. Preferably, the eigenvalues are determined by performing an eigenvalue decomposition of the monopulse ratio matrix to generate eigenvalues, and the angles of the targets may be determined from the eigenvalues by the use of a look-up table.

Monopulse Array Radar With Single Difference Beam For Simultaneous Azimuth And Elevation Angle Determination

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US Patent:
6483478, Nov 19, 2002
Filed:
Jan 31, 2001
Appl. No.:
09/773146
Inventors:
Kai-Bor Yu - Niskayuna NY
David Jay Murrow - Lake Monticello VA
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
H01Q 2100
US Classification:
343853, 342372
Abstract:
A radar monopulse signal receiving system according to an aspect of the invention provides sum ( ) and a single difference () beam outputs from the beamformer. This is accomplished by encoding the information relating to the azimuth and elevation difference beams onto a single complex number. By comparison with some prior-art arrangements, the number of channels required for processing the signals is reduced. Near the end of the monopulse processing, the quotient is taken of complex number divided by the sum beam information, which directly produces a complex monopulse ratio m=m +jm. The azimuth and elevation monopulse ratios are represented by m and m , respectively.

Radar System And Method Including Superresolution Raid Counting

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US Patent:
6498581, Dec 24, 2002
Filed:
Sep 5, 2001
Appl. No.:
09/946187
Inventors:
Kai-Bor Yu - Niskayuna NY
Assignee:
Lockheed Martin Corporation
International Classification:
G01S 1300
US Classification:
342 90, 342 77, 342 80, 342147, 342195
Abstract:
A system identifies a number of targets within a main beam of an antenna array that transmits the main beam and receives echo returns from the main beam. A covariance matrix is generated using the echo returns. The presence of at least one target within a single range cell is detected. A plurality of consecutive pulses are transmitted in a direction of the single range cell within a sufficiently short period that the at least one target remains within the single range cell while the plurality of consecutive pulses are transmitted. An echo signal is sampled from each of the plurality of pulses. An updated covariance matrix is estimated each time the echo signal is sampled. An eigenvalue decomposition is updated each time the covariance matrix is updated. The number of targets in the single range cell is estimated, based on the updated eigenvalue decomposition.

Digital Beamforming Radar System And Method With Super-Resolution Multiple Jammer Location

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US Patent:
6567034, May 20, 2003
Filed:
Sep 5, 2001
Appl. No.:
09/947026
Inventors:
Kai-Bor Yu - Niskayuna NY
Assignee:
Lockheed Martin Corporation
International Classification:
G01S 736
US Classification:
342 16, 342 77, 342 80, 342149, 342195, 342417, 342427
Abstract:
In a radar system, sampled aperture data are received from an antenna array. The sampled aperture data include data that do not correspond to echo returns from a beam transmitted by the antenna. A covariance matrix is generating using the sampled aperture data. An eigenvalue decomposition is performed on the covariance matrix. A direction of arrival is determined from which at least one jammer is transmitting a signal included in the sampled aperture data, based on the eigenvalue decomposition.

Adaptive Digital Beamforming Radar Method And System For Maintaining Multiple Source Angle Super-Resolution Capability In Jamming

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US Patent:
6653973, Nov 25, 2003
Filed:
Sep 7, 2001
Appl. No.:
09/949032
Inventors:
Kai-Bor Yu - Niskayuna NY
Assignee:
Lockheed Martin Corporation
International Classification:
G01S 1348
US Classification:
342 90, 342 17, 342154
Abstract:
A method and system for are provided for detecting one or more radar targets of interest in the presence of jamming signals. A plurality of sub-arrays are formed from an antenna array. Sub-array beams are adaptively formed so as to point one or more nulls in one or more respective directions corresponding to one or more jammers. A super-resolution technique is applied to determine a count of the one or more radar targets and to determine the corresponding direction of arrival.

Adaptive Digital Sub-Array Beamforming And Deterministic Sum And Difference Beamforming, With Jamming Cancellation And Monopulse Ratio Preservation

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US Patent:
6661366, Dec 9, 2003
Filed:
Jun 15, 2001
Appl. No.:
09/882348
Inventors:
Kai-Bor Yu - Niskayuna NY
Assignee:
Lockheed Martin Corporation
International Classification:
G01S 736
US Classification:
342 17, 342 13, 342 16, 342 74, 342 75, 342 80, 342147, 342149, 342159, 342175
Abstract:
A radar system and technique provide the capability to detect a target of interest and maintain the detection in the presence of multiple mainlobe and sidelobe jamming interference. The system and technique utilize digital beamforming to form sub-arrays for canceling jamming interference. Jamming is adaptively suppressed in the sub-arrays prior to using conventional deterministic methods to form the sum, , and difference, , beams for monopulse processing. The system and technique provide the ability to detect a target of interest, provide an undistorted monopulse ratio, m, and maintain target angle estimation, in the presence of multiple mainlobe and multiple sidelobe jammers.

Pri-Staggered Post-Doppler Adaptive Monopulse Processing For Detection And Location Of A Moving Target In Ground Clutter

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US Patent:
6720910, Apr 13, 2004
Filed:
Aug 16, 2001
Appl. No.:
09/930891
Inventors:
Kai-Bor Yu - Niskayuna NY
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
G01S 1352
US Classification:
342162, 342152, 342194
Abstract:
A method, apparatus, and processing system for radar detection and tracking of a target using monopulse ratio processing comprising the following steps. First, receiving a signal comprised of a plurality of sum azimuth beams and difference azimuth beams. Then staggering the received signal. Next, filtering and localizing a clutter signal which is a portion of the received sum and azimuth beams. Then adaptively forming a sub-array sum azimuth beam and a sub-array difference azimuth beam from the filtered output to cancel the clutter. The adaptive beam forming including the determination of a sum and difference beam weight where the adaptive weight be equated to a product of the weight and the respective covariance matrices of the sum and difference beams, the product having no constraint points. Finally, forming a final sum azimuth beam and final difference beam where the first sub array is related to the sum and azimuth beams of a plurality of other sub-array sum and difference beams, an overall final sum beam is formed and is used for target detection. In addition, an overall final difference beam is formed and the ratio of the overall final difference beam to the overall final sum beam is used for angle location determination.
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Kai-Bor Yu from Schenectady, NY Get Report